If you haven't seen one of these before, it might be a little surprising. We're so accustomed to power tools being powered by electricity, we've forgotten about treadles.
The Hobbies company, based in England, produced their treadle-powered fretsaws until at least the 1970s, making minor modifications to the design over the decades. It was a good choice for children, letting them learn while minimizing the risk involved.
Judging from the design of this model, called the A.I., I'm guessing it's from the early 1900s, maybe the 1920s.